Stethoscope



(No Model.)

B. S. BOYDSTONY.

STETHOSCUPE Patented Oct. 14, 1890.

me News rams co., mgm-umu.. wAwwamm u. c.

UNITED STATES .PATENT OFFICE,

BENJAMIN S. BOYDSTON, OF CLUNETTE, INDIANA.

STETHOSCOPE.

SPECIFICATION forming part of Letters Patent No. 438,521, dated October 14, 1890. Application filed September 19., 1889. Serial No. 324,465. (No model.) I

To all whom it may concern:

Be it known that I, BENJAMIN S. BoYDsToN, a citizen of the United States, residing at Clunette, in the county of Kosciusko, in the State of Indiana, have invented a new and useful Improvementin Stethoscopes; and I do hereby declare the following to be afull, clear, and exact specification thereof, reference being had to the accompanying drawing, in which the iig-ure is a sectional elevation of my improved stethoscope.

This invention relates to improvements in stethoscopes; and it consists of the novel construction and combination of parts, as Will fully appear from the following description and accompanying illustration.

In the drawing, A is a large bell-shaped cup for collecting sounds, the lower iiared portion of which is somewhat contracted, providing adownward-facing shoulder a, and upon which is fitted a rubber band B, projecting a short distance beyond the lower edge thereof and resting against said shoulder. This rubber band provides for producing a more perfect bearing or fit upon the chest of an emaciated person than would otherwise be effected.

C C are two much smaller cups, preferably funnel shape, which have screw threaded tubular connection, as at b, with the top of the cup A, said smaller cups depending within the latter, receiving sound therefrom, and their tubular portions b projecting therethrough some distance, providing for the connection therewith of rubberor iiexible tubing D D, the outer ends of which are provided with tubes c c, which in practice are applied to the ears.

Having thus described this invention, what I claim, and desire to secure by Letters Patent, 1s

The stethoscope consisting of the large bellshaped cup and the inner smaller funnelshaped cups connected to said large cup and provided with flexible tubing adapted for application to the ears, substantially as specified.

BENJAMIN S. BOYDSTON.

Vitncsses:

CYRUS M. ALWARD, NELSON N. BoYDsToN. 

